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Hevonen
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[SOLVED] Lift, reading on the scale
Mandy stands on a weighing scale inside a lift (elevator) that accelerates vertically upwards. The forces on Mandy are her weight W and the reaction force from the scale R.
The reading of the scale is
A. R + W.
B. W.
C. R.
D. R – W.
The right answer is C, but I consider that the scale records Mandy's weight that must either weight at rest or weight at acceleration (there is two types of definition for weight; here I assume that it is weight >= weight(rest) ). So, the answer which follows this way should be A. However, it is wrong.
Please, feel free to comment.
Homework Statement
Mandy stands on a weighing scale inside a lift (elevator) that accelerates vertically upwards. The forces on Mandy are her weight W and the reaction force from the scale R.
The reading of the scale is
A. R + W.
B. W.
C. R.
D. R – W.
The Attempt at a Solution
The right answer is C, but I consider that the scale records Mandy's weight that must either weight at rest or weight at acceleration (there is two types of definition for weight; here I assume that it is weight >= weight(rest) ). So, the answer which follows this way should be A. However, it is wrong.
Please, feel free to comment.